ETIOLOGY 



99 



§ 85. Etiology. Moore isolated and described a patho- 

 genic bacterium which he designated Badermmsangtmiarmm. 

 With this oraranism the 



disease has been produced 

 in health}- fowls both by 

 feeding cultures and by in- 

 travenous injections. Its 

 etiological relation to the 

 disease is, therefore, quite 

 clearly established. It is 

 possible that certain accom- 

 panying conditions may be 

 necessary in conjunction 

 with the organism to cause 











Fig. 13. Bacterium sanguinarium. 



the disease to spread rapidly in a flock. Experimentally it 

 did not spread from diseased (inoculated or fed) to healthy 

 fowls when kept in the same yard. 



Fig. 14. A cluDip of Bad. sanguinarium in a blood space in the liver. 

 (a) Bacteria, {b) red blood corpuscles, [c) liver cells {much enlarged). 



^86. Symptoms. From the statement of the owners of 

 the diseased fowls in the different outbreaks and from the ap- 

 pearance of those in which the disease was artificially pro- 



